Circulating belt type continuous roasting system with adjustable and controllable atmosphere and temperature

Abstract

The utility model discloses a circulating belt type continuous roasting system with adjustable and controllable atmosphere and temperature, which comprises a crushing device, a mixing device, a forming device, a circulating belt type continuous roasting device, a reduction / oxidation cooling device and an ore dressing system which are arranged in sequence, the circulating belt type continuous roasting device comprises a trolley, a high-temperature flue gas generating device, an air blowing drying section, an air draft drying section, an air draft preheating section, an air draft roasting section and an air blowing cooling section, the reduction / oxidation cooling device is used for carrying out reduction / oxidation cooling treatment on the block mass treated by the blast cooling section, the reduction / oxidation cooling device is connected with the high-temperature flue gas generating device through a gas outlet pipe, the gas outlet pipe is connected with a gas inlet pipe of the reduction / oxidation cooling device through a circulating gas circuit, and a cooling medium for the reduction / oxidation cooling device is introduced through the gas inlet pipe. The device can meet the industrial treatment requirements of refractory iron ore and ceramic materials prepared from bulk solid wastes.

Description

Technical Field

[0001] The utility model relates to the technical fields of mineral processing, bulk industrial solid waste treatment and smelting, and in particular to a circulating belt type continuous roasting system with adjustable and controllable atmosphere and temperature. Background Art

[0002] There are a large number of difficult-to-select iron ores in China, such as siderite and limonite. Currently, the processing of such ores is mainly through roasting, which transforms the iron-containing substances in carbonate or other forms into iron oxides. In order to ensure the recovery rate of iron elements, iron is usually converted into magnetite, and then iron is recovered through grinding and separation. Among them, roasting process and equipment are the limiting links in the utilization of difficult-to-select iron ore.

[0003] At present, there are two main roasting processes for the above-mentioned difficult-to-select iron ore: rotary kiln roasting and flash magnetization roasting. The two processes mainly have the following problems: During the high-temperature roasting process of the rotary kiln process, the ore is partially pulverized during the roasting process, resulting in ring formation in the kiln; the flash magnetization roasting process requires efficient dry fine grinding of the raw ore, and at the same time requires precise control of the atmosphere and fluidization of the roasting process, and there is a problem of production jams caused by suppressing flow loss.

[0004] In view of the above problems, a belt continuous roasting process is proposed to treat such ores. However, the core content of the existing process is to crush the ore to less than 1 mm, and then mix it with coal powder (including bituminous coal, anthracite, etc.) (granulation or non-granulation can be selected) for roasting. This process is a typical reduction magnetization roasting process. The roasting process requires precise control of the atmosphere, especially CO, H 2 , CO 2 The partial pressure of components such as etc., and subsequent cooling or water quenching under protective atmosphere conditions is required. The overall process has very high requirements on the process sealing of the equipment and the air-fuel ratio control of the burner. So far, there has been no report on industrial implementation.

[0005] On the other hand, the output of domestic bulk industrial solid waste is also high, and most of it is currently treated in the form of stockpiling, which not only occupies a large amount of land, but also causes serious environmental pollution. At present, it is impossible to achieve a good balance between environmental protection and comprehensive utilization. In recent years, research on the preparation of ceramsite materials has been carried out for bulk tailings, fly ash, coal gangue, dust ash and other bulk industrial solid wastes with high silicon and aluminum content, but currently it is still mainly based on rotary kilns, tunnel kilns or box sintering. The main problem is that the degree of automation of the process equipment is low, and continuous production cannot be achieved, resulting in low output and relatively poor quality of finished products.

[0006] Therefore, it is necessary to design a system that can efficiently process such difficult-to-select iron ore and bulk industrial solid waste to solve the above problems. Utility Model Content

[0007] The purpose of the utility model is to provide a circulating belt continuous roasting system with adjustable and controllable atmosphere and temperature to solve the problems existing in the above-mentioned prior art and meet the needs of industrial processing of refractory iron ore and industrial processing of bulk solid waste to prepare ceramic materials.

[0008] To achieve the above purpose, the utility model provides the following solutions:

[0009] The utility model provides a circulating belt type continuous roasting system with adjustable and controllable atmosphere and temperature, comprising a crushing device, a mixing device, a molding device, a circulating belt type continuous roasting device, a reduction / oxidation cooling device and a ore dressing system which are arranged in sequence, wherein the crushing device is used for crushing and treating refractory iron ore or bulk industrial solid waste, the mixing device is used for mixing and treating the crushed ore or bulk industrial solid waste, the molding device is used for agglomerating the mixed ore or bulk industrial solid waste, and the circulating belt type continuous roasting device is used for roasting the raw materials;

[0010] The circulating belt continuous roasting device comprises a trolley, a high-temperature smoke generating device, and a blast drying section, an exhaust drying section, an exhaust preheating section, an exhaust roasting section and a blast cooling section arranged in sequence along the running direction of the trolley. The trolley is used to arrange the produced briquettes. The outlet of the high-temperature smoke generating device is respectively connected to the smoke hoods of the upper part of the exhaust roasting section and the upper part of the exhaust preheating section through a flue. The lower part of the exhaust roasting section is connected to the smoke hood of the upper part of the exhaust drying section through a first induced draft fan. The lower part of the exhaust preheating section is connected to the lower part of the blast drying section through a second induced draft fan. The lower part of the exhaust drying section is connected to the third induced draft fan through a pipeline. The blast drying section The upper smoke hood is connected to the fourth induced draft fan through a pipeline, and the smoke hood at the upper part of the exhaust preheating section is also provided with an adjustable air inlet, which is connected to the lower part of the exhaust roasting section through an adjustable air duct, and a fifth induced draft fan is arranged on the adjustable air duct. A branch pipeline is arranged on the pipeline connecting the lower part of the exhaust drying section and the third induced draft fan, and the branch pipeline is connected to the lower part of the blast cooling section. A sixth induced draft fan is arranged on the branch pipeline, and a cold air duct is also connected to the branch pipeline for introducing external cold air into the blast cooling section through the sixth induced draft fan. The upper smoke hood of the blast cooling section is connected to the high-temperature smoke generating device through a seventh induced draft fan;

[0011] The reduction / oxidation cooling device is used to perform reduction / oxidation cooling treatment on the agglomerates after being treated by the blast cooling section, the reduction / oxidation cooling device is connected to the high-temperature flue gas generating device via an outlet pipe, the outlet pipe is connected to the inlet pipe of the reduction / oxidation cooling device via a circulating gas path, and the cooling medium used by the reduction / oxidation cooling device is introduced through the inlet pipe;

[0012] The ore dressing system is used to perform separation processing on the agglomerates treated by the reduction / oxidation cooling device.

[0013] Preferably, the third induced draft fan and the fourth induced draft fan are connected to dust removal equipment via exhaust pipes respectively.

[0014] Preferably, a distribution device is provided between the forming device and the circulating belt continuous roasting device, and the distribution device is used to evenly distribute the produced agglomerates on the trolley.

[0015] Preferably, a discharge device is provided between the circulating belt continuous roasting device and the reduction / oxidation cooling device, and the discharge device is used to deliver the agglomerates processed by the blast cooling section to the reduction / oxidation cooling device.

[0016] Preferably, the crushing device is a jaw crusher, and the mixing device is a vertical intensive mixer.

[0017] Preferably, the dust removal equipment is a bag dust collector.

[0018] Preferably, the material distributing device is a roller type material distributing device.

[0019] Preferably, the unloading device is a unloading vehicle.

[0020] Compared with the prior art, the utility model has achieved the following technical effects:

[0021] The utility model provides a circulating belt type continuous roasting system with adjustable and controllable atmosphere and temperature. The system crushes, mixes and shapes the hard-to-select iron ore or bulk industrial solid waste, and then dries, preheats, roasts and cools the agglomerates through a circulating belt type continuous roasting device. The high-temperature flue gas generated by the high-temperature flue gas generating device is used as a heat source for drying, preheating and roasting the hard-to-select iron ore / bulk industrial solid waste. The roasted agglomerates are then protectively cooled using cooling gas. Then, they can be crushed, ground and separated according to process requirements to obtain finished iron concentrates and tailings, or ceramsite, etc., thereby realizing the industrialized treatment and resource utilization of hard-to-select iron ore or bulk industrial solid waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1It is a schematic diagram of the structural connection between the circulating belt continuous roasting device, the reduction / oxidation cooling device and the ore dressing system in the utility model;

[0024] Figure 2 This is a processing flow chart of the utility model applied to difficult-to-select iron ore;

[0025] Figure 3 The utility model is applied to the treatment flow chart of bulk industrial solid waste.

[0026] In the figure: 1-circulating belt continuous roasting device, 2-reduction / oxidation cooling device, 3-ore dressing system, 4-high-temperature flue gas generating device, 5-blast drying section, 6-exhaust drying section, 7-exhaust preheating section, 8-exhaust roasting section, 9-blast cooling section, 10-first induced draft fan, 11-second induced draft fan, 12-third induced draft fan, 13-fourth induced draft fan, 14-adjusting air duct, 15-fifth induced draft fan, 16-branch duct, 17-sixth induced draft fan, 18-cold air duct, 19-seventh induced draft fan, 20-exhaust pipe, 21-circulating air circuit, 22-inlet pipe, 23-dust removal equipment. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] The purpose of the utility model is to provide a circulating belt continuous roasting system with adjustable and controllable atmosphere and temperature to solve the problems existing in the prior art and meet the needs of industrial processing of refractory iron ore and industrial processing of bulk solid waste to prepare ceramic materials.

[0029] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] like Figure 1-Figure 3As shown, this embodiment provides a circulating belt type continuous roasting system with adjustable and controllable atmosphere and temperature, comprising a crushing device, a mixing device, a molding device, a circulating belt type continuous roasting device 1, a reduction / oxidation cooling device 2 and a beneficiation system 3 which are arranged in sequence, wherein the crushing device is used for crushing and processing refractory iron ore or bulk industrial solid waste, the mixing device is used for mixing the crushed ore or bulk industrial solid waste, the molding device is used for agglomerating the mixed ore or bulk industrial solid waste, and the circulating belt type continuous roasting device 1 is used for roasting the raw material; specifically, the crushing device can be a jaw crusher, and the mixing device can be a vertical intensive mixer; the shape of the agglomerate can be cylindrical, pyramidal or ellipsoidal, and the binder in the molding process can be sodium-based modified bentonite, polyvinyl alcohol, sodium humate, etc.; the reduction / oxidation cooling device 2 can be a vertical cooling tank;

[0031] The circulating belt continuous roasting device 1 comprises a trolley, a high-temperature smoke generating device 4, and a blast drying section 5, an exhaust drying section 6, an exhaust preheating section 7, an exhaust roasting section 8, and a blast cooling section 9 which are sequentially arranged along the running direction of the trolley. The trolley is used to arrange the produced agglomerates. The outlet of the high-temperature smoke generating device 4 is respectively connected to the smoke hoods at the upper part of the exhaust roasting section 8 and the upper part of the exhaust preheating section 7 through a flue. The lower part of the exhaust roasting section 8 is connected to the smoke hood at the upper part of the exhaust drying section 6 through a first induced draft fan 10. The lower part of the exhaust preheating section 7 is connected to the lower part of the blast drying section 5 through a second induced draft fan 11. The lower part of the exhaust drying section 6 is connected to the third induced draft fan 12 through a pipeline. The upper smoke hood of the blast drying section 5 A fourth induced draft fan 13 is connected through a pipeline, and a smoke hood at the upper part of the exhaust preheating section 7 is also provided with an adjustable air inlet, which is connected to the lower part of the exhaust roasting section 8 through an adjustable air duct 14, and a fifth induced draft fan 15 is provided on the adjustable air duct 14. A branch pipeline 16 is provided on the pipeline connecting the lower part of the exhaust drying section 6 and the third induced draft fan 12, and the branch pipeline 16 is connected to the lower part of the blast cooling section 9. A sixth induced draft fan 17 is provided on the branch pipeline 16, and a cold air duct 18 is also connected to the branch pipeline 16, which is used to introduce external cold air into the blast cooling section 9 through the sixth induced draft fan 17, and the smoke hood at the upper part of the blast cooling section 9 is connected to the high-temperature flue gas generating device 4 through the seventh induced draft fan 19;

[0032] The reduction / oxidation cooling device 2 is used to perform reduction / oxidation cooling treatment on the agglomerates treated by the blast cooling section 9. The reduction / oxidation cooling device 2 is connected to the high-temperature flue gas generating device 4 via an outlet pipe 20. The outlet pipe 20 is connected to the inlet pipe 22 of the reduction / oxidation cooling device 2 via a circulating gas path 21. The cooling medium used by the reduction / oxidation cooling device 2 is introduced into the inlet pipe 22. The reduction / oxidation cooling device 2 can adopt a vertical cooling tank.

[0033] The ore dressing system 3 is used to perform separation processing on the agglomerates after being processed by the reduction / oxidation cooling device 2 .

[0034] The hard-to-select iron ore or bulk industrial solid waste is crushed, mixed and formed, and then the agglomerates are dried, preheated and roasted through a circulating belt continuous roasting device 1. The high-temperature flue gas generated by the high-temperature flue gas generating device 4 is used as a heat source for drying, preheating and roasting the hard-to-select iron ore / bulk industrial solid waste, and then the roasted agglomerates are protectively cooled with cooling gas. Then, according to the process requirements, they can be crushed, ground and separated to obtain finished iron concentrates and tailings, or ceramsite, etc., thereby realizing the industrial treatment of hard-to-select iron ore or bulk industrial solid waste.

[0035] In this embodiment, the third induced draft fan 12 and the fourth induced draft fan 13 are respectively connected to the dust removal device 23 through an exhaust pipe. Specifically, the dust removal device 23 is a bag dust collector, but is not limited to a bag dust collector.

[0036] In this embodiment, a material distribution device is provided between the forming device and the endless belt continuous roasting device 1, and the material distribution device is used to evenly distribute the formed agglomerates on the trolley. Specifically, the material distribution device can be a roller type material distribution device.

[0037] In this embodiment, a discharge device is provided between the circulating belt continuous roasting device 1 and the reduction / oxidation cooling device 2, and the discharge device is used to deliver the agglomerates processed by the blast cooling section 9 to the reduction / oxidation cooling device 2. Specifically, the discharge device can be a discharge vehicle.

[0038] This system can achieve that the raw materials to be processed are in a stationary state during operation, reducing the amount of breakage. At the same time, the machine speed, atmosphere and temperature are adjustable, which can ensure that the atmosphere properties of the roasting process are adjustable between weak oxidizing atmosphere and strong oxidizing atmosphere. At the same time, by adding a tank cooling device later, gases of different properties can continue to be processed to meet the needs of process treatment.

[0039] The processing of refractory iron ore specifically includes the following steps:

[0040] 1. Use jaw crusher to dry crush the siderite / limonite ore;

[0041] 2. The crushed ore is mixed by a vertical intensive mixer, and then the mixed ore is agglomerated by a forming device. The shape of the agglomerate can be cylindrical, pyramidal or ellipsoidal. The binder in the forming process can be sodium-based modified bentonite, polyvinyl alcohol, sodium humate, etc.

[0042] 3. The prepared agglomerates are evenly arranged on the trolley of the circulating belt type continuous roasting device 1 through a roller type material distribution device, and the thickness of the material layer on the trolley is adjustable; wherein the trolley circulation mode of the circulating belt type continuous roasting device 1 can be any one of annular circulation, plane circulation or vertical circulation; the circulating belt type continuous roasting device 1 is divided into five parts along the running direction of the trolley: a blast drying section 5, an exhaust drying section 6, an exhaust preheating section 7, an exhaust roasting section 8 and a blast cooling section 9; the fuel used by the high temperature flue gas generating device 4 of the circulating belt type continuous roasting device 1 can be a gaseous Or solid fuel, during operation, the high-temperature flue gas first enters the upper fume hood of the exhaust roasting section 8 and the upper fume hood of the exhaust preheating section 7. After heat exchange in the exhaust roasting section 8, the high-temperature flue gas is introduced into the upper fume hood of the exhaust drying section 6 through the first induced draft fan 10 at the lower part of the exhaust roasting section 8. The exhaust gas from the lower part of the exhaust drying section 6 is introduced into the dust removal equipment 23 through the third induced draft fan 12 and then discharged; the exhaust gas from the lower part of the exhaust preheating section 7 is introduced into the lower part of the blast drying section 5 through the second induced draft fan 11, passes through the material layer upwards, and is introduced into the dust removal equipment 23 through the fourth induced draft fan 13 and then discharged;

[0043] 4. After the agglomerates pass through the blast cooling section 9, they enter the reduction / oxidation cooling device 2 through the unloading vehicle, and cooling air is introduced into the reduction / oxidation cooling device 2 for cooling treatment. After the agglomerates are cooled, they enter the mineral processing system 3 for separation treatment to separate the iron ore concentrate and tailings. The cooling air coming out of the reduction / oxidation cooling device 2 can be circulated to the high-temperature flue gas generating device 4 for use after dust removal treatment, and can also be returned to the reduction / oxidation cooling device 2 for use again.

[0044] Through this system, siderite ore with a grade of about 30% and limonite ore with a grade of about 40% can be effectively processed to obtain a finished concentrate with a grade of more than 55% and an iron recovery rate of more than 80%. The tailings can be further used in cement, ceramsite, mineral gelling filling materials, etc.

[0045] The following is a specific example of using the system to process siderite and limonite type refractory iron ores.

[0046] Embodiment 1:

[0047] 1. Dry crushing the siderite ore;

[0048] 2. Mix the crushed ore and then use a forming device to agglomerate the mixed ore. The agglomerate is in the shape of an ellipsoid. The binder in the forming process is sodium-based modified bentonite, and the addition amount is 1.5% of the mass of the mixed ore. The water content is 8% of the mass of the mixed ore.

[0049] 3. The prepared agglomerates are evenly arranged on the trolley of the circulating belt continuous roasting device 1 through the material distribution device, and the thickness of the material layer on the trolley is controlled to be no more than 300 mm;

[0050] The trolley circulation mode of the circulating belt type continuous roasting device 1 is a plane circulation;

[0051] The circulating belt type continuous roasting device 1 is divided into five parts along the running direction of the trolley: a blast drying section 5, an exhaust drying section 6, an exhaust preheating section 7, an exhaust roasting section 8 and a blast cooling section 9; the fuel used by the high temperature flue gas generating device 4 of the circulating belt type continuous roasting device 1 can be a gaseous or solid fuel. During operation, the high temperature flue gas first enters the upper fume hood of the exhaust roasting section 8 and the upper fume hood of the exhaust preheating section 7. After heat exchange in the exhaust roasting section 8, the high temperature flue gas is introduced into the upper fume hood of the exhaust drying section 6 through the first induced draft fan 10 at the lower part of the exhaust roasting section 8. The exhaust gas coming out of the lower part of the exhaust drying section 6 is introduced into the dust removal device 23 through the third induced draft fan 12 and then discharged; the exhaust gas coming out of the lower part of the exhaust preheating section 7 is introduced into the lower part of the blast drying section 5 through the second induced draft fan 11, and after passing through the material layer upward, it is introduced into the dust removal device 23 through the fourth induced draft fan 13 and then discharged;

[0052] 4. After being cooled by the blast cooling section 9, the calcined agglomerates enter the reduction / oxidation cooling device 2 through the unloading vehicle, and at the same time, reducing / inert cooling gas is introduced into the reduction / oxidation cooling device 2 for cooling; the agglomerates coming out of the reduction / oxidation cooling device 2 are processed by the grinding + magnetic separation process.

[0053] The TFe grade of the calcined agglomerates is greater than 40%, the grade of the iron concentrate obtained after crushing and magnetic separation is 58%, and the iron recovery rate is 85%.

[0054] Embodiment 2:

[0055] 1. Dry crushing the siderite ore;

[0056] 2. Mix the crushed ore and then use a forming device to agglomerate the mixed ore. The agglomerate is in the shape of an ellipsoid. Polyvinyl alcohol is used as a binder in the forming process. The added amount is 0.5% of the mass of the mixed ore, and the water content is 10% of the mass of the mixed ore.

[0057] 3. The prepared agglomerates are evenly arranged on the trolley of the circulating belt continuous roasting device 1 through the material distribution device, and the thickness of the material layer on the trolley is controlled to be no more than 400 mm;

[0058] The trolley circulation mode of the circulating belt type continuous roasting device 1 is vertical circulation;

[0059] The circulating belt type continuous roasting device 1 is divided into five parts along the running direction of the trolley: a blast drying section 5, an exhaust drying section 6, an exhaust preheating section 7, an exhaust roasting section 8 and a blast cooling section 9; the fuel used by the high temperature flue gas generating device 4 of the circulating belt type continuous roasting device 1 can be a gaseous or solid fuel. During operation, the high temperature flue gas first enters the upper fume hood of the exhaust roasting section 8 and the upper fume hood of the exhaust preheating section 7. After heat exchange in the exhaust roasting section 8, the high temperature flue gas is introduced into the upper fume hood of the exhaust drying section 6 through the first induced draft fan 10 at the lower part of the exhaust roasting section 8. The exhaust gas coming out of the lower part of the exhaust drying section 6 is introduced into the dust removal device 23 through the third induced draft fan 12 and then discharged; the exhaust gas coming out of the lower part of the exhaust preheating section 7 is introduced into the lower part of the blast drying section 5 through the second induced draft fan 11, and after passing through the material layer upward, it is introduced into the dust removal device 23 through the fourth induced draft fan 13 and then discharged;

[0060] 4. After being cooled by the blast cooling section 9, the calcined agglomerates enter the reduction / oxidation cooling device 2 through the unloading vehicle, and at the same time, reducing / inert cooling gas is introduced into the reduction / oxidation cooling device 2 for cooling; the agglomerates coming out of the reduction / oxidation cooling device 2 are processed by the grinding + magnetic separation process.

[0061] The TFe grade of the calcined agglomerates is greater than 42%, the grade of the iron concentrate obtained after crushing and magnetic separation is 60%, and the iron recovery rate is 88%.

[0062] Embodiment 3:

[0063] 1. Dry crushing the siderite ore;

[0064] 2. Mix the crushed ore and then use a forming device to agglomerate the mixed ore. The agglomerate is in the shape of an ellipsoid. Sodium humate is used as a binder in the forming process. The addition amount is 1.0% of the mass of the mixed ore, and the water content is 8% of the mass of the mixed ore.

[0065] 3. The prepared agglomerates are evenly arranged on the trolley of the circulating belt continuous roasting device 1 through the material distribution device, and the thickness of the material layer on the trolley is controlled to be no more than 500 mm;

[0066] The trolley circulation mode of the circulating belt continuous roasting device is a circular circulation;

[0067] The circulating belt type continuous roasting device 1 is divided into five parts along the running direction of the trolley: a blast drying section 5, an exhaust drying section 6, an exhaust preheating section 7, an exhaust roasting section 8 and a blast cooling section 9; the fuel used by the high temperature flue gas generating device 4 of the circulating belt type continuous roasting device 1 can be a gaseous or solid fuel. During operation, the high temperature flue gas first enters the upper fume hood of the exhaust roasting section 8 and the upper fume hood of the exhaust preheating section 7. After heat exchange in the exhaust roasting section 8, the high temperature flue gas is introduced into the upper fume hood of the exhaust drying section 6 through the first induced draft fan 10 at the lower part of the exhaust roasting section 8. The exhaust gas coming out of the lower part of the exhaust drying section 6 is introduced into the dust removal device 23 through the third induced draft fan 12 and then discharged; the exhaust gas coming out of the lower part of the exhaust preheating section 7 is introduced into the lower part of the blast drying section 5 through the second induced draft fan 11, and after passing through the material layer upward, it is introduced into the dust removal device 23 through the fourth induced draft fan 13 and then discharged;

[0068] 4. After being cooled by the blast cooling section 9, the calcined agglomerates enter the reduction / oxidation cooling device 2 through the unloading vehicle, and at the same time, reducing / inert cooling gas is introduced into the reduction / oxidation cooling device 2 for cooling; the agglomerates coming out of the reduction / oxidation cooling device 2 are processed by the grinding + magnetic separation process.

[0069] The TFe grade of the calcined agglomerates is greater than 44%, the grade of the iron concentrate obtained after crushing and magnetic separation is 61%, and the iron recovery rate is 89%.

[0070] Embodiment 4:

[0071] 1. Dry crushing of limonite ore;

[0072] 2. Mix the crushed ore and then use a forming device to agglomerate the mixed ore. The agglomerate is in the shape of an ellipsoid. Sodium humate is used as a binder in the process. The addition amount is 0.5% of the mass of the mixed ore, and the water content is 10% of the mass of the mixed ore.

[0073] 3. The prepared agglomerates are evenly arranged on the trolley of the circulating belt continuous roasting device 1 through the material distribution device, and the thickness of the material layer on the trolley is controlled to be no more than 500 mm;

[0074] The trolley circulation mode of the circulating belt continuous roasting device is a circular circulation;

[0075] The circulating belt type continuous roasting device 1 is divided into five parts along the running direction of the trolley: a blast drying section 5, an exhaust drying section 6, an exhaust preheating section 7, an exhaust roasting section 8 and a blast cooling section 9; the fuel used by the high temperature flue gas generating device 4 of the circulating belt type continuous roasting device 1 can be a gaseous or solid fuel. During operation, the high temperature flue gas first enters the upper fume hood of the exhaust roasting section 8 and the upper fume hood of the exhaust preheating section 7. After heat exchange in the exhaust roasting section 8, the high temperature flue gas is introduced into the upper fume hood of the exhaust drying section 6 through the first induced draft fan 10 at the lower part of the exhaust roasting section 8. The exhaust gas coming out of the lower part of the exhaust drying section 6 is introduced into the dust removal device 23 through the third induced draft fan 12 and then discharged; the exhaust gas coming out of the lower part of the exhaust preheating section 7 is introduced into the lower part of the blast drying section 5 through the second induced draft fan 11, and after passing through the material layer upward, it is introduced into the dust removal device 23 through the fourth induced draft fan 13 and then discharged;

[0076] 4. After being cooled by the blast cooling section 9, the calcined agglomerates enter the reduction / oxidation cooling device 2 through the unloading vehicle, and at the same time, reducing / inert cooling gas is introduced into the reduction / oxidation cooling device 2 for cooling; the agglomerates coming out of the reduction / oxidation cooling device 2 are processed by the grinding + magnetic separation process.

[0077] The TFe grade of the calcined agglomerates is greater than 47%, the grade of the iron concentrate obtained after crushing and magnetic separation is 65%, and the iron recovery rate is 80%.

[0078] Embodiment 5:

[0079] 1. Dry crushing of limonite ore;

[0080] 2. Mix the crushed ore and then use a forming device to agglomerate the mixed ore. The agglomerate is in the shape of an ellipsoid. Sodium humate is used as a binder in the process. The addition amount is 1.0% of the mass of the mixed ore, and the water content is 19% of the mass of the mixed ore.

[0081] 3. The prepared cold-consolidated agglomerates are evenly arranged on the trolley of the circulating belt continuous roasting device 1 through the material distribution device, and the thickness of the material layer on the trolley is controlled to be no more than 500 mm;

[0082] The trolley circulation mode of the circulating belt continuous roasting device is a circular circulation;

[0083] The circulating belt type continuous roasting device 1 is divided into five parts along the running direction of the trolley: a blast drying section 5, an exhaust drying section 6, an exhaust preheating section 7, an exhaust roasting section 8 and a blast cooling section 9; the fuel used by the high temperature flue gas generating device 4 of the circulating belt type continuous roasting device 1 can be a gaseous or solid fuel. During operation, the high temperature flue gas first enters the upper fume hood of the exhaust roasting section 8 and the upper fume hood of the exhaust preheating section 7. After heat exchange in the exhaust roasting section 8, the high temperature flue gas is introduced into the upper fume hood of the exhaust drying section 6 through the first induced draft fan 10 at the lower part of the exhaust roasting section 8. The exhaust gas coming out of the lower part of the exhaust drying section 6 is introduced into the dust removal device 23 through the third induced draft fan 12 and then discharged; the exhaust gas coming out of the lower part of the exhaust preheating section 7 is introduced into the lower part of the blast drying section 5 through the second induced draft fan 11, and after passing through the material layer upward, it is introduced into the dust removal device 23 through the fourth induced draft fan 13 and then discharged;

[0084] 4. After being cooled by the blast cooling section 9, the calcined agglomerates enter the reduction / oxidation cooling device 2 through the unloading vehicle, and at the same time, reducing / inert cooling gas is introduced into the reduction / oxidation cooling device 2 for cooling; the agglomerates coming out of the reduction / oxidation cooling device 2 are processed by the grinding + magnetic separation process.

[0085] The TFe grade of the calcined agglomerates is greater than 49%, the grade of the iron concentrate obtained after crushing and magnetic separation is 67%, and the iron recovery rate is 85%.

[0086] Typical bulk industrial solid waste treatment includes the following steps:

[0087] 1. Use jaw crusher to dry crush coal gangue and fly ash;

[0088] 2. The crushed gangue and fly ash are mixed in a certain proportion by a vertical strong mixer, or the mixed ore is agglomerated by a disc granulator. The shape of the finished agglomerate is ellipsoidal or round;

[0089] 3. The prepared agglomerates are evenly arranged on the trolley of the circulating belt type continuous roasting device 1 through a roller type material distribution device, and the thickness of the material layer on the trolley is adjustable; wherein the trolley circulation mode of the circulating belt type continuous roasting device 1 can be any one of annular circulation, plane circulation or vertical circulation; the circulating belt type continuous roasting device 1 is divided into five parts along the running direction of the trolley: a blast drying section 5, an exhaust drying section 6, an exhaust preheating section 7, an exhaust roasting section 8 and a blast cooling section 9; the fuel used by the high temperature flue gas generating device 4 of the circulating belt type continuous roasting device 1 can be a gaseous Or solid fuel, during operation, the high-temperature flue gas first enters the upper fume hood of the exhaust roasting section 8 and the upper fume hood of the exhaust preheating section 7. After heat exchange in the exhaust roasting section 8, the high-temperature flue gas is introduced into the upper fume hood of the exhaust drying section 6 through the first induced draft fan 10 at the lower part of the exhaust roasting section 8. The exhaust gas from the lower part of the exhaust drying section 6 is introduced into the dust removal equipment 23 through the third induced draft fan 12 and then discharged; the exhaust gas from the lower part of the exhaust preheating section 7 is introduced into the lower part of the blast drying section 5 through the second induced draft fan 11, passes through the material layer upwards, and is introduced into the dust removal equipment 23 through the fourth induced draft fan 13 and then discharged;

[0090] 4. After the agglomerates pass through the blast cooling section 9, they enter the reduction / oxidation cooling device 2 through the unloading device, and cooling air is introduced into the reduction / oxidation cooling device 2 for cooling treatment. After the agglomerates are cooled, they enter the finished product silo for storage; the cooling air coming out of the reduction / oxidation cooling device 2 can be circulated to the high-temperature flue gas generating device 4 for use after dust removal, and can also be returned to the reduction / oxidation cooling device 2 for use again.

[0091] Through this system, coal gangue, fly ash, iron tailings, etc. can be comprehensively utilized to prepare ceramsite that meets national standards in strength and particle size, and is applied to water treatment, gas filtration and construction industries. Specific embodiments are shown below.

[0092] Embodiment 6:

[0093] 1. Dry crushing of coal gangue and fly ash;

[0094] 2. Mix the crushed gangue and fly ash in a certain proportion, and then use a forming device or a disc granulating device to agglomerate the mixed ore. The shape of the finished agglomerate is ellipsoidal or round, and the moisture content is 10% of the mass of the mixed ore;

[0095] 3. The prepared lumps or pellets are evenly arranged on the trolley of the circulating belt continuous roasting device 1 through the material distribution device, and the thickness of the material layer on the trolley is controlled to be no more than 500 mm;

[0096] The trolley circulation mode of the circulating belt continuous roasting device is vertical circulation;

[0097] The circulating belt type continuous roasting device 1 is divided into five parts along the running direction of the trolley: a blast drying section 5, an exhaust drying section 6, an exhaust preheating section 7, an exhaust roasting section 8 and a blast cooling section 9; the fuel used by the high temperature flue gas generating device 4 of the circulating belt type continuous roasting device 1 can be a gaseous or solid fuel. During operation, the high temperature flue gas first enters the upper fume hood of the exhaust roasting section 8 and the upper fume hood of the exhaust preheating section 7. After heat exchange in the exhaust roasting section 8, the high temperature flue gas is introduced into the upper fume hood of the exhaust drying section 6 through the first induced draft fan 10 at the lower part of the exhaust roasting section 8. The exhaust gas coming out of the lower part of the exhaust drying section 6 is introduced into the dust removal device 23 through the third induced draft fan 12 and then discharged; the exhaust gas coming out of the lower part of the exhaust preheating section 7 is introduced into the lower part of the blast drying section 5 through the second induced draft fan 11, and after passing through the material layer upward, it is introduced into the dust removal device 23 through the fourth induced draft fan 13 and then discharged;

[0098] 4. After the agglomerates pass through the blast cooling section 9, they enter the reduction / oxidation cooling device 2 through the unloading device, and at the same time, oxidizing / inert cooling gas is introduced into the reduction / oxidation cooling device 2 for cooling treatment. After cooling, the agglomerates enter the finished product silo for storage; the cooling gas coming out of the reduction / oxidation cooling device 2 can be circulated to the high-temperature flue gas generating device 4 for use after dust removal, and can also be returned to the reduction / oxidation cooling device 2 for use again.

[0099] For detailed process flow, see Figure 3 .

[0100] Embodiment 7:

[0101] 1. Dry crushing of coal gangue, fly ash and iron tailings;

[0102] 2. Mix the crushed gangue, fly ash and iron tailings in a certain proportion, and then use a forming device or a disc granulating device to agglomerate the mixed ore. The shape of the finished agglomerate is ellipsoidal or round, and the moisture content is 12% of the mass of the mixed ore;

[0103] 3. The prepared lumps or pellets are evenly arranged on the trolley of the circulating belt continuous roasting device 1 through the material distribution device, and the thickness of the material layer on the trolley is controlled to be no more than 500 mm;

[0104] The trolley circulation mode of the circulating belt continuous roasting device is vertical circulation;

[0105] The circulating belt type continuous roasting device 1 is divided into five parts along the running direction of the trolley: a blast drying section 5, an exhaust drying section 6, an exhaust preheating section 7, an exhaust roasting section 8 and a blast cooling section 9; the fuel used by the high temperature flue gas generating device 4 of the circulating belt type continuous roasting device 1 can be a gaseous or solid fuel. During operation, the high temperature flue gas first enters the upper fume hood of the exhaust roasting section 8 and the upper fume hood of the exhaust preheating section 7. After heat exchange in the exhaust roasting section 8, the high temperature flue gas is introduced into the upper fume hood of the exhaust drying section 6 through the first induced draft fan 10 at the lower part of the exhaust roasting section 8. The exhaust gas coming out of the lower part of the exhaust drying section 6 is introduced into the dust removal device 23 through the third induced draft fan 12 and then discharged; the exhaust gas coming out of the lower part of the exhaust preheating section 7 is introduced into the lower part of the blast drying section 5 through the second induced draft fan 11, and after passing through the material layer upward, it is introduced into the dust removal device 23 through the fourth induced draft fan 13 and then discharged;

[0106] 4. After the agglomerates pass through the blast cooling section 9, they enter the reduction / oxidation cooling device 2 through the unloading device, and at the same time, oxidizing / inert cooling gas is introduced into the reduction / oxidation cooling device 2 for cooling treatment. After cooling, the agglomerates enter the finished product silo for storage; the cooling gas coming out of the reduction / oxidation cooling device 2 can be circulated to the high-temperature flue gas generating device 4 for use after dust removal, and can also be returned to the reduction / oxidation cooling device 2 for use again.

[0107] For detailed process flow, see Figure 3 .

[0108] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A circulating belt type continuous roasting system with adjustable and controllable atmosphere and temperature, characterized in that: It comprises a crushing device, a mixing device, a forming device, a circulating belt type continuous roasting device, a reduction / oxidation cooling device and a beneficiation system which are arranged in sequence, wherein the crushing device is used for crushing and processing refractory iron ore or bulk industrial solid waste, the mixing device is used for mixing the crushed ore or bulk industrial solid waste, the forming device is used for agglomerating the mixed ore or bulk industrial solid waste, and the circulating belt type continuous roasting device is used for roasting the raw materials; The circulating belt continuous roasting device comprises a trolley, a high-temperature smoke generating device, and a blast drying section, an exhaust drying section, an exhaust preheating section, an exhaust roasting section and a blast cooling section arranged in sequence along the running direction of the trolley. The trolley is used to arrange the produced briquettes. The outlet of the high-temperature smoke generating device is respectively connected to the smoke hoods of the upper part of the exhaust roasting section and the upper part of the exhaust preheating section through a flue. The lower part of the exhaust roasting section is connected to the smoke hood of the upper part of the exhaust drying section through a first induced draft fan. The lower part of the exhaust preheating section is connected to the lower part of the blast drying section through a second induced draft fan. The lower part of the exhaust drying section is connected to the third induced draft fan through a pipeline. The blast drying section The upper smoke hood is connected to the fourth induced draft fan through a pipeline, and the smoke hood at the upper part of the exhaust preheating section is also provided with an adjustable air inlet, which is connected to the lower part of the exhaust roasting section through an adjustable air duct, and a fifth induced draft fan is arranged on the adjustable air duct. A branch pipeline is arranged on the pipeline connecting the lower part of the exhaust drying section and the third induced draft fan, and the branch pipeline is connected to the lower part of the blast cooling section. A sixth induced draft fan is arranged on the branch pipeline, and a cold air duct is also connected to the branch pipeline for introducing external cold air into the blast cooling section through the sixth induced draft fan. The upper smoke hood of the blast cooling section is connected to the high-temperature smoke generating device through a seventh induced draft fan; The reduction / oxidation cooling device is used to perform reduction / oxidation cooling treatment on the agglomerates after being treated by the blast cooling section, the reduction / oxidation cooling device is connected to the high-temperature flue gas generating device via an outlet pipe, the outlet pipe is connected to the inlet pipe of the reduction / oxidation cooling device via a circulating gas path, and the cooling medium used by the reduction / oxidation cooling device is introduced through the inlet pipe; The ore dressing system is used to perform separation processing on the agglomerates treated by the reduction / oxidation cooling device.

2. The circulating belt type continuous roasting system with adjustable and controllable atmosphere and temperature according to claim 1 is characterized in that: The third induced draft fan and the fourth induced draft fan are connected to dust removal equipment via exhaust pipes respectively.

3. The circulating belt type continuous roasting system with adjustable and controllable atmosphere and temperature according to claim 1 is characterized in that: A material distribution device is provided between the forming device and the circulating belt type continuous roasting device, and the material distribution device is used to evenly distribute the formed lumps on the trolley.

4. The circulating belt type continuous roasting system with adjustable and controllable atmosphere and temperature according to claim 1 is characterized in that: A discharge device is provided between the circulating belt continuous roasting device and the reduction / oxidation cooling device, and the discharge device is used to deliver the agglomerates processed by the blast cooling section to the reduction / oxidation cooling device.

5. The circulating belt type continuous roasting system with adjustable and controllable atmosphere and temperature according to claim 1 is characterized in that: The crushing device is a jaw crusher, and the mixing device is a vertical intensive mixer.

6. The circulating belt type continuous roasting system with adjustable and controllable atmosphere and temperature according to claim 2 is characterized in that: The dust removal equipment is a bag dust collector.

7. The circulating belt type continuous roasting system with adjustable and controllable atmosphere and temperature according to claim 3 is characterized in that: The material distributing device is a roller type material distributing device.

8. The circulating belt type continuous roasting system with adjustable and controllable atmosphere and temperature according to claim 4 is characterized in that: The unloading device is a unloading vehicle.

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